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authorJanne Grunau <j@jannau.net>2009-09-02 02:24:08 +0400
committerMauro Carvalho Chehab <mchehab@redhat.com>2009-09-12 19:20:04 +0400
commitf51fad85af7b296b56031747c873c309b24ff77c (patch)
tree305bd99ffc616a9320ae9826a2e7d8f952566a6b /drivers
parent01886255ddf440eb21d3388bfc5343c966904d0e (diff)
downloadlinux-f51fad85af7b296b56031747c873c309b24ff77c.tar.xz
V4L/DVB (12686): dvb-core: check supported QAM modulations
Check the modulation in dvb_frontend_check_parameters against frontend's capabilties for FE_QAM devices. Signed-off-by: Janne Grunau <j@jannau.net> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/media/dvb/dvb-core/dvb_frontend.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/media/dvb/dvb-core/dvb_frontend.c b/drivers/media/dvb/dvb-core/dvb_frontend.c
index 0cb6c09719f2..d13ebcb0c6b6 100644
--- a/drivers/media/dvb/dvb-core/dvb_frontend.c
+++ b/drivers/media/dvb/dvb-core/dvb_frontend.c
@@ -838,6 +838,15 @@ static int dvb_frontend_check_parameters(struct dvb_frontend *fe,
}
}
+ /* check for supported modulation */
+ if (fe->ops.info.type == FE_QAM &&
+ (parms->u.qam.modulation > QAM_AUTO ||
+ !((1 << (parms->u.qam.modulation + 10)) & fe->ops.info.caps))) {
+ printk(KERN_WARNING "DVB: adapter %i frontend %i modulation %u not supported\n",
+ fe->dvb->num, fe->id, parms->u.qam.modulation);
+ return -EINVAL;
+ }
+
return 0;
}